{"id":57966,"date":"2024-10-12T19:14:15","date_gmt":"2024-10-12T11:14:15","guid":{"rendered":"https:\/\/server.hk\/cnblog\/57966\/"},"modified":"2024-10-12T19:14:15","modified_gmt":"2024-10-12T11:14:15","slug":"net-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%b3%87%e6%ba%90%e7%9a%84%e6%ad%a3%e7%a2%ba%e9%87%8b%e6%94%be%e6%96%b9%e6%b3%95-net-%e6%95%b8%e6%93%9a%e5%ba%ab-%e8%b3%87%e6%ba%90%e9%87%8b%e6%94%be","status":"publish","type":"post","link":"https:\/\/server.hk\/cnblog\/57966\/","title":{"rendered":".NET \u6578\u64da\u5eab\u8cc7\u6e90\u7684\u6b63\u78ba\u91cb\u653e\u65b9\u6cd5 (.net \u6578\u64da\u5eab \u8cc7\u6e90\u91cb\u653e)"},"content":{"rendered":"<h1 id=\"net-%e6%95%b8%e6%93%9a%e5%ba%ab%e8%b3%87%e6%ba%90%e7%9a%84%e6%ad%a3%e7%a2%ba%e9%87%8b%e6%94%be%e6%96%b9%e6%b3%95-kKNfwkwdZg\">.NET \u6578\u64da\u5eab\u8cc7\u6e90\u7684\u6b63\u78ba\u91cb\u653e\u65b9\u6cd5<\/h1>\n<p>\u5728\u958b\u767c .NET \u61c9\u7528\u7a0b\u5e8f\u6642\uff0c\u6578\u64da\u5eab\u64cd\u4f5c\u662f\u4e0d\u53ef\u6216\u7f3a\u7684\u4e00\u90e8\u5206\u3002\u7121\u8ad6\u662f\u4f7f\u7528 ADO.NET\u3001Entity Framework \u9084\u662f\u5176\u4ed6\u6578\u64da\u8a2a\u554f\u6280\u8853\uff0c\u6b63\u78ba\u91cb\u653e\u6578\u64da\u5eab\u8cc7\u6e90\u90fd\u662f\u78ba\u4fdd\u61c9\u7528\u7a0b\u5e8f\u6027\u80fd\u548c\u7a69\u5b9a\u6027\u7684\u95dc\u9375\u3002\u672c\u6587\u5c07\u63a2\u8a0e .NET \u6578\u64da\u5eab\u8cc7\u6e90\u7684\u6b63\u78ba\u91cb\u653e\u65b9\u6cd5\uff0c\u5e6b\u52a9\u958b\u767c\u8005\u907f\u514d\u5e38\u898b\u7684\u8cc7\u6e90\u6d29\u6f0f\u554f\u984c\u3002<\/p>\n<h2 id=\"%e7%82%ba%e4%bb%80%e9%ba%bc%e9%9c%80%e8%a6%81%e9%87%8b%e6%94%be%e6%95%b8%e6%93%9a%e5%ba%ab%e8%b3%87%e6%ba%90-kKNfwkwdZg\">\u70ba\u4ec0\u9ebc\u9700\u8981\u91cb\u653e\u6578\u64da\u5eab\u8cc7\u6e90<\/h2>\n<p>\u6578\u64da\u5eab\u9023\u63a5\u3001\u547d\u4ee4\u548c\u8b80\u53d6\u5668\u7b49\u8cc7\u6e90\u5728\u4f7f\u7528\u5f8c\u5fc5\u9808\u88ab\u91cb\u653e\uff0c\u5426\u5247\u53ef\u80fd\u5c0e\u81f4\u4ee5\u4e0b\u554f\u984c\uff1a<\/p>\n<ul>\n<li>\u8cc7\u6e90\u6d29\u6f0f\uff1a\u672a\u91cb\u653e\u7684\u8cc7\u6e90\u6703\u4f54\u7528\u7cfb\u7d71\u5167\u5b58\uff0c\u5c0e\u81f4\u61c9\u7528\u7a0b\u5e8f\u6027\u80fd\u4e0b\u964d\u3002<\/li>\n<li>\u9023\u63a5\u6c60\u8017\u76e1\uff1a\u5982\u679c\u9023\u63a5\u672a\u6b63\u78ba\u95dc\u9589\uff0c\u53ef\u80fd\u6703\u5c0e\u81f4\u9023\u63a5\u6c60\u4e2d\u7684\u53ef\u7528\u9023\u63a5\u6578\u91cf\u6e1b\u5c11\uff0c\u6700\u7d42\u4f7f\u61c9\u7528\u7a0b\u5e8f\u7121\u6cd5\u7372\u53d6\u65b0\u7684\u6578\u64da\u5eab\u9023\u63a5\u3002<\/li>\n<li>\u6578\u64da\u4e0d\u4e00\u81f4\uff1a\u5728\u67d0\u4e9b\u60c5\u6cc1\u4e0b\uff0c\u672a\u91cb\u653e\u7684\u8cc7\u6e90\u53ef\u80fd\u5c0e\u81f4\u6578\u64da\u5eab\u64cd\u4f5c\u7684\u7d50\u679c\u4e0d\u4e00\u81f4\u3002<\/li>\n<\/ul>\n<h2 id=\"%e6%ad%a3%e7%a2%ba%e9%87%8b%e6%94%be%e6%95%b8%e6%93%9a%e5%ba%ab%e8%b3%87%e6%ba%90%e7%9a%84%e6%96%b9%e6%b3%95-kKNfwkwdZg\">\u6b63\u78ba\u91cb\u653e\u6578\u64da\u5eab\u8cc7\u6e90\u7684\u65b9\u6cd5<\/h2>\n<h3 id=\"%e4%bd%bf%e7%94%a8-using-%e8%aa%9e%e5%8f%a5-kKNfwkwdZg\">\u4f7f\u7528 `using` \u8a9e\u53e5<\/h3>\n<p>\u5728 .NET \u4e2d\uff0c\u6700\u7c21\u55ae\u4e14\u6709\u6548\u7684\u91cb\u653e\u8cc7\u6e90\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 `using` \u8a9e\u53e5\u3002\u9019\u6a23\u53ef\u4ee5\u78ba\u4fdd\u5728\u4f7f\u7528\u5b8c\u8cc7\u6e90\u5f8c\u81ea\u52d5\u91cb\u653e\u5b83\u5011\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u4f7f\u7528 `using` \u8a9e\u53e5\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>using (SqlConnection connection = new SqlConnection(connectionString))\n{\n    connection.Open();\n    using (SqlCommand command = new SqlCommand(query, connection))\n    {\n        using (SqlDataReader reader = command.ExecuteReader())\n        {\n            while (reader.Read())\n            {\n                \/\/ \u8655\u7406\u6578\u64da\n            }\n        }\n    }\n}<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c`SqlConnection`\u3001`SqlCommand` \u548c `SqlDataReader` \u90fd\u6703\u5728 `using` \u5340\u584a\u7d50\u675f\u6642\u81ea\u52d5\u91cb\u653e\uff0c\u7121\u9700\u624b\u52d5\u8abf\u7528 `Dispose` \u65b9\u6cd5\u3002<\/p>\n<h3 id=\"%e6%89%8b%e5%8b%95%e9%87%8b%e6%94%be%e8%b3%87%e6%ba%90-kKNfwkwdZg\">\u624b\u52d5\u91cb\u653e\u8cc7\u6e90<\/h3>\n<p>\u5982\u679c\u4e0d\u4f7f\u7528 `using` \u8a9e\u53e5\uff0c\u958b\u767c\u8005\u9700\u8981\u624b\u52d5\u91cb\u653e\u8cc7\u6e90\u3002\u9019\u901a\u5e38\u6d89\u53ca\u5230\u8abf\u7528 `Dispose` \u65b9\u6cd5\u6216 `Close` \u65b9\u6cd5\u3002\u4ee5\u4e0b\u662f\u4e00\u500b\u624b\u52d5\u91cb\u653e\u8cc7\u6e90\u7684\u7bc4\u4f8b\uff1a<\/p>\n<pre><code>SqlConnection connection = null;\nSqlCommand command = null;\nSqlDataReader reader = null;\n\ntry\n{\n    connection = new SqlConnection(connectionString);\n    connection.Open();\n    command = new SqlCommand(query, connection);\n    reader = command.ExecuteReader();\n\n    while (reader.Read())\n    {\n        \/\/ \u8655\u7406\u6578\u64da\n    }\n}\nfinally\n{\n    if (reader != null) reader.Close();\n    if (command != null) command.Dispose();\n    if (connection != null) connection.Close();\n}<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c`finally` \u5340\u584a\u78ba\u4fdd\u4e86\u5373\u4f7f\u5728\u57f7\u884c\u904e\u7a0b\u4e2d\u767c\u751f\u7570\u5e38\uff0c\u8cc7\u6e90\u4e5f\u6703\u88ab\u6b63\u78ba\u91cb\u653e\u3002<\/p>\n<h3 id=\"%e4%bd%bf%e7%94%a8-orm-%e6%a1%86%e6%9e%b6-kKNfwkwdZg\">\u4f7f\u7528 ORM \u6846\u67b6<\/h3>\n<p>\u5982\u679c\u4f7f\u7528 Entity Framework \u7b49 ORM \u6846\u67b6\uff0c\u8cc7\u6e90\u91cb\u653e\u901a\u5e38\u7531\u6846\u67b6\u81ea\u52d5\u8655\u7406\u3002\u7136\u800c\uff0c\u958b\u767c\u8005\u4ecd\u9700\u6ce8\u610f\u4e0a\u4e0b\u6587\u7684\u751f\u547d\u9031\u671f\uff0c\u78ba\u4fdd\u5728\u4e0d\u518d\u9700\u8981\u6642\u91cb\u653e\u8cc7\u6e90\u3002\u4f8b\u5982\uff1a<\/p>\n<pre><code>using (var context = new MyDbContext())\n{\n    var data = context.MyEntities.ToList();\n    \/\/ \u8655\u7406\u6578\u64da\n}<\/code><\/pre>\n<p>\u5728\u9019\u500b\u7bc4\u4f8b\u4e2d\uff0c`MyDbContext` \u6703\u5728 `using` \u5340\u584a\u7d50\u675f\u6642\u81ea\u52d5\u91cb\u653e\u3002<\/p>\n<h2 id=\"%e7%b5%90%e8%ab%96-kKNfwkwdZg\">\u7d50\u8ad6<\/h2>\n<p>\u6b63\u78ba\u91cb\u653e .NET \u6578\u64da\u5eab\u8cc7\u6e90\u662f\u958b\u767c\u9ad8\u6548\u3001\u7a69\u5b9a\u61c9\u7528\u7a0b\u5e8f\u7684\u95dc\u9375\u3002\u7121\u8ad6\u662f\u4f7f\u7528 `using` \u8a9e\u53e5\u9084\u662f\u624b\u52d5\u91cb\u653e\u8cc7\u6e90\uff0c\u958b\u767c\u8005\u90fd\u61c9\u8a72\u990a\u6210\u826f\u597d\u7684\u7fd2\u6163\uff0c\u4ee5\u907f\u514d\u8cc7\u6e90\u6d29\u6f0f\u548c\u6027\u80fd\u554f\u984c\u3002\u900f\u904e\u9019\u4e9b\u65b9\u6cd5\uff0c\u60a8\u53ef\u4ee5\u78ba\u4fdd\u61c9\u7528\u7a0b\u5e8f\u5728\u904b\u884c\u6642\u7684\u7a69\u5b9a\u6027\u548c\u6548\u7387\u3002<\/p>\n<p>\u5982\u9700\u4e86\u89e3\u66f4\u591a\u95dc\u65bc <a href=\"https:\/\/server.hk\">VPS<\/a> \u548c\u6578\u64da\u5eab\u7ba1\u7406\u7684\u8cc7\u8a0a\uff0c\u8acb\u8a2a\u554f\u6211\u5011\u7684\u7db2\u7ad9\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"<p>\u4e86\u89e3\u5982\u4f55\u6b63\u78ba\u91cb\u653e .NET \u6578\u64da\u5eab\u8cc7\u6e90\uff0c\u78ba\u4fdd\u61c9\u7528\u7a0b\u5e8f\u6027\u80fd\u548c\u7a69\u5b9a\u6027\uff0c\u907f\u514d\u5167\u5b58\u6d29\u6f0f\u548c\u8cc7\u6e90\u6d6a\u8cbb\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[101],"tags":[],"class_list":["post-57966","post","type-post","status-publish","format-standard","hentry","category-database"],"_links":{"self":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/57966","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/comments?post=57966"}],"version-history":[{"count":1,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/57966\/revisions"}],"predecessor-version":[{"id":57967,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/posts\/57966\/revisions\/57967"}],"wp:attachment":[{"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/media?parent=57966"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/categories?post=57966"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/server.hk\/cnblog\/wp-json\/wp\/v2\/tags?post=57966"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}